Not my own project, but my thesis I've done in my masters year for Engineering which was on "Automatic analysis of eye-tracking data using object detection algorithms" written in C. This was completely done on linux using OpenCV as part of image processing. I used gtk for designing a simple user friendly interface.

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This was the thesis I did when I studied for Industrial Engineering at De Nayer. Do do this project/thesis we had some binoculars with a camera pointing towards what we are looking. Another camera was looking to the eye's iris in order to register where the person was looking to. With all the data I wrote a program in C that could interpret and register products where the person was looking to. The screens will show you a bit what the result of the program was.

The paper can be found at: http://www.eavise.be/mastertheses/Ichiche.pdf